Double-acting duplex pump



B. F. CURTIS.

DOUBLE ACTING-DUPLEX PUMP.

APPLICATION FILED SEPT. 3. 1920.

1,400,477, Patented Dec. 13, 1921.

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.F. [Lurfis alikozmuf B. F. CURTIS.

DOUBLE ACTING DUPLEX PUMP. I

APPLICATION FILED SEPT. 3, I920- .F. Burcis SHEETS-SHEET 2.

Patented Dec. 13, 1921.

B. F. CURTIS.

DOUBLE ACTING DUPLEX PUMP.

' v APPLICATION FILED S EPT. 3; I920. 1 ,400,477.

Patented Dec. 13, 1921;

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ELF- llur'fis M w m t G UNITED STATES BENJAMIN F. CURTIS, 0F POTEAU,OKLAHOMA.

DOUBLE-ACTING DUPLEX PUMP.

Specification of Letters Patent; Patented Dec; 13 1921 Application filedSeptember 3, 1920, Serial No. 407,947.

To all whom it may concern:

Be it known that I','BENJA1WIIN F. CURTIS, a citizen of the UnitedStates, residing at Po-teau, in the county of Le, Flore and State ofOklahoma, have invented certain new and useful Improvements inDouble-Acting Duplex Pumps, of which: the following is a specification.i

This invention relates to pumps, and. the primary object of theinvention is to provide an improved pump especiallydesigned for use inpumping'fiuids, which are liable to have a detrimental effect on thepump, such as fluids containingacids or the like. The life of pumpsutilized in pumping water from mines or in parts of the country whereacid in the water is prevalent, is generally short owing to the factthat the acid eats the metal from which the pumps are constructed. Thisnot only, entails the expense of repairing or buying new pumps,rbut alsoresult-sin loss of time, while the new pumps are being installed, or"while the old pumps are being repaired. 7

It is therefore a prime object of the invention to provide a pumpconstructed wholly, of vitreous material, so that the same can withstandthe chemical action of the acids."

Another prime object of the invention is to provide a pump embodying aminimum number of parts so arranged that access to the working portionofthe pumps can be readily had, and to provide a pump having an improvedarrangement of partsand ways so that an exceedingly simple and compactstructure will be had.

A further prime object of the invention isto provide a pump constructedof vitreous material embodying a air of cylinders molded en bloc,detacha le head's'for the block carrying the inlet and outlet valveswhich are arranged-therewith in. a) novel manner, and, an improved meansfor connecting the. blocks and the heads together.

A still further objectof the invention is to provide an improved pump ofthe above character, which willbe durable and eflicient in use, onevthat will be simple-and easy to manufacture, and one which can be placedupon the market at a reasonable cost;

With these and' other objectsrin view, the invention consists in thenovel construction, arrangementancl formation of parts as will behereinafter more specifically: described,

Fig. 3 is a vertical transverse section through the pump illustratingthev arrangement ofthe valves-in the pump head, taken on the line 33 ofFig. 1.

Fig. 4: is a fragmentary horizontal section through the pumpillustrating the arrangement of the outlet ports and ways therein'Referring to the drawings indetail, wherein similar reference charactersdesigna-te corresponding parts throughout the several views, the letterA indicates the improved pump which includes the cylinder block B; theheads C and D; the pistons-E and F; the outlet or discharge valves G;and'the inletor suction valves H; Thecylinder block B isformed wholly ofvitreous material, such as glass, porcelain or the like, and may.be'molded or formedxin any other preferred manner. The block B containsthe horizontally alined bores 5 and 6, which have reciprocally mountedtherein pistons E and F which will be hereinafter more spe cificallydescribed.

The bores 5 and 6 are divided by the par tition wall 7, which hasarranged therein above and below the bores 5 and 6 the discharge way or;bore 8 and the inlet way or bore 9. It can be seen that by arranging theinlet anddischargeways or ports, at the central portion of the block andin vertical alinement, only one main way or port is necessary for thedischarge and inlet or suction valves, a l 1 A nipple 10 isxformed onthe cylinderblock B at the; central portion thereofand communicateswiththeldischarge way or boreS andthis nipple carries the air'chamber11,

which is forthepurpose of introducing an air cushion to counteract thesolidity of the, water, thus, preventing shock as the waterflows'through the valves; A plurality ofbores 12 having a relativelysmall diameter are also extended longitudinally through the block, for apurpose which will be hereinafter more fully described.

Theiheads-Cxand Dare also formed of vitreous material, such as glass orporcelain, and are connected to the terminals of the cylinder block, bymeans of longitudinally extending bolts 13 which extend through thebores 12 and in alined bores 14: formed in the heads. The terminals ofthe bolts 13 have threaded thereon suitable retaining nuts 15. The headC is provided with an upper central discharge oroutlet way or port 16which alines with the discharge or outlet wayor bore 8 in the cylinderblock. The lower end of the head G is provided with a central inlet wayor port 17, which alines with the inlet way or bore 9 formed in theblock B. These ways or bores 16 and 17 curve upwardly and downwardly asclearly shown in Fig. 1 of the drawings, so

, as to facilitate the communication-thereof with the outlet ordischarge ports and the inlet or suction ports. The ways or ports 16 andITGXtGHd entirely through the head C as clearly shown and are adapted tohave connected thereto the inlet and discharge pipes, (not shown), andsuitable bolts 18 are anchored in the head C so as to facilitate theconnection of the inlet and outlet pipes therewith. The Way or bore 16has communicating therewith the laterally projecting transverse ways 19,which communicate with the'discharge or outlet ports 20. These ports 20extend inwardly from the upper surface of the head C and are providedwith cover plates 21, which are held in position by means of bolts 22which are anchored in. the head. These ports 20 extend above anddirectly at the terminals of the cylinder bores 5 and 6. Theinlet way 17also has communicating therewith the laterally extending transverse ways23, which also communicate with theinlet ports 24, which are formeddirectly in rear of the cylinder bores 5 and 6. These ports 2 1 extendoutwardly of the sides of the cylinder head B and are. provided withcover plates 25 which'are also held in place by means of bolts 26 whichare anchored in the sides as .the ports 20 and '24 are formed inthe headC and therefore description of the same is superfluous. 7 r

The dischargeiivalves G: and the inlet valves H are arranged in theirrespectiwa ports and are alsoiformed ofvitreousma: 'terial. Each one ofthese portsis provided with annular grooves 31, in which seat, annularvalve seats 32 which are preferably formed of rubber or the like,

Each of the discharge or outlet valves G includes a cylindrical valvebody 33, which is slidably mounted on a depending valve stem 34, whichis carried by the port covers 21. These valve bodies 38 are normallyheld as their seats by means of expansion springs 85 which are coiledaround t 1e valve stems, and these springs bear against the uppersurface of the valve bodies 33 and against flanges or collars 37 formedon the valve stems. By this construction, it can be seen that when it isdesiredto repair a valve, it is merely necessary to remove one of thecover plates 21 and lift the valve off the seat through said ports. r

The inlet valves also include the disk} valvebodies 38 which fit uponthe valve seats 32 and are adapted to be lifted off the same by thesuction of the pistons. These valves are normally held on their seats bymeans of leaf springs 39, one end of which is secured directlyto thevalve and the other end to the covers 25 as at 10. When it is desired tomove these valves, it is merely necesary to remove the cover plates andthe valves will be lifted ofi their seats therewith.

From :the arrangement of the valves in the cylinder heads C and D itwill be seen that fluid will be pumped in each cylinder on each strokeof the'pistons E and F, as it can be seen that there is an inlet andoutlet port arranged ateach end of each cylinder.

. a The pistons E and F are constructed identically the same and arealso formed of vitreous material such'as glass or porcelain.

Each ofthe pistons includes the sections 40 and 4e1,which are providedwith longitudi nally extending bores 12 for the reception of the pistonrods 43. The piston rods 43 are preferably formed from bronze or brassand are provided with annular flanges 44' which are adapted to engagethe outer'surface of the sectionsl. The inner free ends of the pistonrods113 are threadedtoa section of the lockadjusting nuts 45, which areadapted to engage the outer surface of the sections 40 and these nutsare adapted to force the sections toward each other. The

sections 40 are provided with reduced cylindrical extensions e6, whichare adapted to slidably fit withinthe enlarged portions 47 of the bores42 formed in the sections 11.

The inner faces'ofthe sections are incilned with the walls of the bores5 and 6. a p

When it is desired to adjust the nuts 45 it is merely necessary tomovefthe pistons to the ends of the cylinders and remove the coverplates 25, which will permit of inser ti'onof 'a' wrenchor the like intoa cylinder for engaging the nuts. The piston rods can Ythenbe rotatedwhich will thread thenuts toward or away from the sections 40 of thepistons according to the'direction of rotation of the piston rods.

The pistons may be actuated in any preferred manner, and the method ofactuating the same forms no part of this invention.

Suitable packing glands 50 are provided for the piston rods 43.

From the foregoing description, it can be seen that an exceptionallysimple and durable pump has been formed, which is constructed wholly ofvitreous material; and which has a novel arrangement of ports and wayswhich permits of an exceedingly compact and simple structure to be had.

Changes in details may be made without departing from the spirit orscope of this invention; but,

I claim:

1. A pump comprising a vitreous body having a pair of longitudinallyextending cylinder bores therein, vitreous heads fitted on the terminalsof the body, longitudinally extending centrally disposed ways, formed inthe block and heads intermediate the cylinder bores, the ways formingthe inlet and discharge for the fluid, pistons reciprocably mounted inthe bores, discharge and inlet ports formed in the heads at theterminals of the cylinder bores, laterally projecting ways connectingthe ports with the longitudinally extending ways, and with the ports,

the ports communicating with the sides and tops of the heads, detachableplates fitted over said ports, depending stems carried by the coverplates for the discharge ports, a slidably mounted valve arranged oneach stem, spring means coiled around the stem engaging said valve, aleaf spring carried by the cover plates for the inlet ports, inletvalves carried by said leaf springs, and annular resilient valve seatsarranged in said ports.

2. A pump comprising a body, a pair of heads detachably connected to theends of the body, the body and heads having a pair of horizontallyalined cylindrical bores formed therein, the bores terminating short ofthe outer ends of the heads, upper and lower vertically alinedlongitudinally extending ways formed in the body and heads intermediatethe cylinder bores and opening out through one of the heads, a pair ofinlet and outlet chambers arranged in each one of the headscommunicating with the cylinder bores, transverse passage wayscommunicating with the upper and lower longitudinally extending ways andwith the pairs of inlet and outlet chambers, discharge and inlet valvesarranged in said chambers, and pistons reciprocably mounted in saidcylinder bores.

BENJAMIN F. CURTIS.

